No, WS₂ is not soluble in dilute hydrochloric acid (HCl). Its solubility is negligible (<10⁻⁶ g/L) in solutions like 1 M HCl at room temperature. WS₂’s covalent W-S bonds and lack of basic or ionic sites make it resistant to attack by dilute acids, which primarily donate protons (H⁺) and chloride ions (Cl⁻). These species cannot disrupt the stable lattice or oxidize WS₂ under mild conditions.
Tests confirm this: soaking WS₂ powder in 1-2 M HCl for days shows no mass loss or dissolved tungsten/sulfur ions via ICP-MS or spectrometry. Unlike metals (e.g., zinc, soluble in HCl), WS₂ does not react to form soluble salts or gases like H₂S under dilute conditions. Stronger acids (e.g., concentrated H₂SO₄) or oxidants (e.g., HNO₃) can slowly degrade WS₂, but dilute HCl lacks the oxidizing power, leaving it inert. Compared to MoS₂, which is similarly insoluble, WS₂’s resistance is robust, though both may show trace surface etching over months.
Temperature (e.g., 50°C) or concentration increases (e.g., 6 M HCl) have minimal effect below WS₂’s thermal limits (510°C in air). This insolubility suits WS₂ for acidic environments (e.g., chemical processing equipment coatings), where stability is critical, though prolonged exposure to concentrated acids requires caution.
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